import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    title: 'dkalfsdj',
    home: Scaffold(
      appBar: AppBar(title: Text('appbar'),),
     body: Center(
       child: Container(
         color: Colors.red,
         constraints: BoxConstraints.loose(Size(100, 100)),
           child: TextButton(child: Text('hellodsfasdgadsf'), onPressed: (){},))    ,
     ),
    ),
  ));
}